net: Add Qualcomm IPC router

Add an implementation of Qualcomm's IPC router protocol, used to
communicate with service providing remote processors.

Signed-off-by: Courtney Cavin <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
[bjorn: Cope with 0 being a valid node id and implement RTM_NEWADDR]
Signed-off-by: Bjorn Andersson <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: courtc

include/linux/socket.h

@@ -201,8 +201,9 @@ struct ucred {
 #define AF_NFC		39	/* NFC sockets			*/
 #define AF_VSOCK	40	/* vSockets			*/
 #define AF_KCM		41	/* Kernel Connection Multiplexor*/
+#define AF_QIPCRTR	42	/* Qualcomm IPC Router          */
 
-#define AF_MAX		42	/* For now.. */
+#define AF_MAX		43	/* For now.. */
 
 /* Protocol families, same as address families. */
 #define PF_UNSPEC	AF_UNSPEC
@@ -249,6 +250,7 @@ struct ucred {
 #define PF_NFC		AF_NFC
 #define PF_VSOCK	AF_VSOCK
 #define PF_KCM		AF_KCM
+#define PF_QIPCRTR	AF_QIPCRTR
 #define PF_MAX		AF_MAX
 
 /* Maximum queue length specifiable by listen.  */

include/uapi/linux/qrtr.h

@@ -0,0 +1,12 @@
+#ifndef _LINUX_QRTR_H
+#define _LINUX_QRTR_H
+
+#include <linux/socket.h>
+
+struct sockaddr_qrtr {
+	__kernel_sa_family_t sq_family;
+	__u32 sq_node;
+	__u32 sq_port;
+};
+
+#endif /* _LINUX_QRTR_H */

net/Kconfig

@@ -236,6 +236,7 @@ source "net/mpls/Kconfig"
 source "net/hsr/Kconfig"
 source "net/switchdev/Kconfig"
 source "net/l3mdev/Kconfig"
+source "net/qrtr/Kconfig"
 
 config RPS
 	bool

net/Makefile

@@ -78,3 +78,4 @@ endif
 ifneq ($(CONFIG_NET_L3_MASTER_DEV),)
 obj-y				+= l3mdev/
 endif
+obj-$(CONFIG_QRTR)		+= qrtr/

net/qrtr/Kconfig

@@ -0,0 +1,24 @@
+# Qualcomm IPC Router configuration
+#
+
+config QRTR
+	tristate "Qualcomm IPC Router support"
+	depends on ARCH_QCOM || COMPILE_TEST
+	---help---
+	  Say Y if you intend to use Qualcomm IPC router protocol.  The
+	  protocol is used to communicate with services provided by other
+	  hardware blocks in the system.
+
+	  In order to do service lookups, a userspace daemon is required to
+	  maintain a service listing.
+
+if QRTR
+
+config QRTR_SMD
+	tristate "SMD IPC Router channels"
+	depends on QCOM_SMD || COMPILE_TEST
+	---help---
+	  Say Y here to support SMD based ipcrouter channels.  SMD is the
+	  most common transport for IPC Router.
+
+endif # QRTR

net/qrtr/Makefile

@@ -0,0 +1,2 @@
+obj-$(CONFIG_QRTR) := qrtr.o
+obj-$(CONFIG_QRTR_SMD) += smd.o